Mangkgateng is an economist with a focus on econometric modelling. She holds a Postgraduate Diploma in Economics from Tshwane University of Technology and is currently pursuing a Master of Commerce in Economics at the University of the Witwatersrand. Mangkgateng is also an entrepreneur, running an online retail enterprise and event management company. She is also the founder of Pads-R-Us, an NGO that provides menstrual products to underprivileged girls.